Gluten-free food has soared in popularity, projected to rake in $2 billion in sales by 2020, a 20% increase from 2015, according to food industry research company Packaged Facts. (Besides those suffering from Celiac disease, there are few health benefits to a gluten-free diet.)

Dunkin's brownie is one of several new items it's introducing, although the rest aren't gluten-free. Other new items include waffle-breaded chicken tenders, pretzel bites and ham and cheese roll-ups. All of these items, which cost $2 each, are part of the chain's new Dunkin' Run menu. The goal is to bring in customers outside of its traditional breakfast rush.